Date.prototype.format = function (fmt) { //author: meizz   
  var o = {
    "M+": this.getMonth() + 1,                 //月份   
    "d+": this.getDate(),                    //日   
    "H+": this.getHours(),
    "h+": this.getHours() % 12 == 0 ? 12 : this.getHours() % 12,   //小时   
    "m+": this.getMinutes(),                 //分   
    "s+": this.getSeconds(),                 //秒   
    "q+": Math.floor((this.getMonth() + 3) / 3), //季度   
    "S": this.getMilliseconds()             //毫秒   
  };
  if (/(y+)/.test(fmt))
    fmt = fmt.replace(RegExp.$1, (this.getFullYear() + "").substr(4 - RegExp.$1.length));
  for (var k in o)
    if (new RegExp("(" + k + ")").test(fmt))
      fmt = fmt.replace(RegExp.$1, (RegExp.$1.length == 1) ? (o[k]) : (("00" + o[k]).substr(("" + o[k]).length)));
  return fmt;
}
module.exports = Date;